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椭圆ax2+by2=1与直线y=1-x交于A、B两点,过原点与线段AB中点的直线...
椭圆ax
2+by
2=1与直线y=1-x交于A、B两点,过原点与线段AB中点的直线的斜率为
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835387179/SYS201311031019018353871004_ST/0.png)
,则
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835387179/SYS201311031019018353871004_ST/1.png)
的值为( )
A.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835387179/SYS201311031019018353871004_ST/2.png)
B.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835387179/SYS201311031019018353871004_ST/3.png)
C.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835387179/SYS201311031019018353871004_ST/4.png)
D.
![manfen5.com 满分网](http://img.manfen5.com/res/GZSX/web/STSource/20131103101901835387179/SYS201311031019018353871004_ST/5.png)
考点分析:
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